Hi FSDT,
with some of the service vehicles there is something wrong... The "wheelbase" is either missing or scales to another LOD at a different distance than the body, giving the impression of cars without wheels (see screenshot).
I noticed this with at least the pictured van, the apron red-blue-striped bus and one of the aircraft tow truck zipping around the airport. the small baggage tow and the tank truck seem to be okay.
Hope you'll do an update for that...
Regards Torsten
